LBJ gives speech to National Association of Broadcasters in Chicago; LBJ Library meeting; responses to LBJ's March 31 speech; Lady Bird visits with her daughters; second LBJ Library meeting; office work; swearing-in ceremony of Angie Biddle Duke at State; Lady Bird talks on phone with Ramsey Clark & Bill White; Lady Bird meets with her staff about next 10 months; Lady Bird works on upcoming Texas trip; Lady Bird receives facial from Diana MacArthur, and they have dinner with LBJ